I have 2 PHONIC MK15 keyboard s. Ive used them as practice s in stereo for my keyboards. Each one is 15 watts and has an 8 custom-designed speaker, 2 channels, 4-band EQ, and a built-in limiter. Enhancements include a headphone jack, CD line in with trim control, and a speaker output. Would work for guitar as well. $25.00 each, $50.00 for the pair.